KR101337234B1 - Multi control method for a plurality of air compressors - Google Patents

Abstract

The present invention relates to an integrated control operation method for multiple air compressors, wherein the method is capable of performing integrated control on the air compressors used in various industrial fields using one integrated controller, and more efficiently operating the air compressors. The present invention relates to the integrated control operation method for the air compressors, wherein the method comprises: a step of forming the air compressors including at least one variable speed drive (VSD) air compressor and normal air compressor; a step of mutually connecting the air compressors and the integrated controller with an RS-485 communication port so that the air compressors and the integrated controller communicate with each other, wherein the integrated controller is made up of air compressor control programs; a step of determining the reference value of working air pressure for a demander, and inputting and storing the reference value in the integrated controller; sequentially stopping the air compressors according to the order of priority, dropping the working air pressure, and recovering the working air pressure to the reference value when the working air pressure for the demander exceeds the reference value; and a step of recovering the working air pressure to the reference value by sequentially operating the stopped air compressors according to the order of priority when the working air pressure for the demander drops below the reference value. [Reference numerals] (1) Integrated controller (ES);(AA) First floor of a main machinery room;(BB) Operation monitoring room;(CC) Basement of a main machinery room

Description

MULTI CONTROL METHOD FOR A PLURALITY OF AIR COMPRESSORS

The present invention relates to a method of integrated control operation of a plurality of air compressors, and more particularly, to integrate a plurality of air compressors that can be integrated control of a plurality of air compressors used in various industrial sites with a single integrated controller and to operate more efficiently It relates to a control operation method.

When a plurality of air compressors are connected and used in various industrial sites, each air compressor is operated on and off manually according to the usage amount, so that an inefficient problem such as a lot of manpower is required for the operation of the plurality of air compressors. have.

This is as follows.

Mechanical regulator air compressors are generally operated on or off by electrical relay signals. Since the start up of the air compressor consumes three-phase high-capacity power, reactor, Y-Δ start (input of initial power into Y connection, change the connection after about 10 seconds, change the connection to Δ, reduce the initial load and start up smoothly) After starting, it continues to operate until it stops manually. (It stops due to the reduction of start-up cost or unpredictable spare time between start-ups, and the start-up repeats are very limited.)

In order to reduce the load at the start of the equipment, it is started in unloading (unloading) state, and when the start is completed, it is manually switched to loading (loading state) to produce air pressure, and when the output is higher than the air consumption, the set pressure is reached. It is automatically switched to unloading upon receiving a signal from the pressure switch, but returns to loading when the pressure decreases due to increased air usage. If unloading is continued, unnecessary power is consumed by no-load operation, and the pressure in the equipment must be discharged (less than 3Bar) to stop the operation. Since the air pressure must be discharged to the outside, repeated stop operation after the initial start is impossible.

Therefore, by manually starting / stopping the air compressor in accordance with the amount of compressed air used at the production site, there is a problem such that a lot of manpower is required.

In order to solve this problem, various technologies for controlling and operating a plurality of air compressors more efficiently and steadily are being developed. This is described below.

A plurality of air compressors for generating compressed air in Reference 1, pressure measuring means for measuring the pressure of the compressed air, power remaining capacity calculating means for calculating the remaining capacity of the power limit value from the consumption of the measured power of the current power consumption, And a control means for controlling the operation amount of the air compressor based on the pressure value of the compressed air and the remaining capacity of the power limit value calculated from the pressure measuring means and the power residual capacity storage means.

Also, reference 2 calculates the discharge pressure change per hour by converting data on the discharge pressure detected from the air compressor and the pressure sensor into analog / digital and compares it with the preset pressure set value to supply or cut off the power input to the compressor. A control method and apparatus for an air compressor including a controller for controlling the driving of a compressor are disclosed.

In addition, the reference management system includes a central management system for setting and inputting parameters of a plurality of air compressors and a plurality of air compressors, determining the interlocking order, and comparing the supply pressure and the low pressure to control the plurality of air compressors on / off. A method of interlocking control of a plurality of air compressors is disclosed.

The prior art for controlling and operating a plurality of air compressors discussed in the above references is to simply control the air compressor by comparing only the change amount of the discharge pressure with a reference pressure. Could not be controlled by a single integrated controller.

Therefore, by connecting a plurality of air compressors to identify the reference data about the driving time, pressure, temperature, current of the air compressor and generate a drive signal including the control value of the air compressor to selectively control one or more air compressors individually In addition, it has not been possible to control and operate a plurality of air compressors composed of various types of air compressors stably and efficiently by not providing integrated control technology.

In addition, the reference to the Republic of Korea Patent Publication No. 10-1999-0078591, the air compressor for compressing air and the lubricant temperature in the air compressor and the compressed air pressure in the main air tank after detecting the air compared with the preset reference set value Disclosed is a method and apparatus for controlling an air compressor, comprising a controller for controlling a drive of a compressor.

In addition, the Republic of Korea Patent Publication No. 10-2012-0078891 discloses that the remote controller of the air conditioner network is transmitted and received in processing different data between different networks in an integrated control system that integrates, manages and controls the equipment installed in the building. It is possible to share data between different networks by converting and transmitting data according to each network, and through this, an integrated control system and its control method for effectively controlling and managing air conditioners and equipment in buildings are published. have.

On the other hand, the present invention is to convert a plurality of air compressors including a variable speed drive (VSD) air compressor to the electronic control unit with a built-in module program (Conversion; individual air compressor by the electronic control system Lording, Unlording, Stop, Changes for intelligent electronic control, such as mounting multiple sensors for individual operation based on the restart value), and converting the data using the RS-485 communication port, which is generally used as the communication control method of the integrated control system. Refer to reference 4 for the RS-485 communication port by connecting and controlling the air compressor. (Korean Invention Patent Publication No. 10-2011-0071529)

(Reference 1) Japanese Laid-Open Patent Publication No. 2010-053733, 2010.03.11. (Reference 2) Japanese Laid-Open Patent Publication No. 1993-164057, 1993.06.29. (Reference 3) Republic of Korea Patent Publication No. 10-2010-0134409, 2010.12.23. (Reference 4) Republic of Korea Patent Publication No. 10-2011-0071529, 2011.06.29.

The present invention converts one or more air compressors used in various industrial sites, connects them to each other through an RS-485 communication port, and connects to an integrated controller in which a predetermined control value for driving an air compressor is input. We want to be able to integrate and control.

In addition, the present invention is to maximize the operating efficiency and increase the energy efficiency of the air compressor by setting the use air pressure reference value to start the plurality of air compressors to the minimum hydrogen to meet the optimal value usage and use air pressure.

In addition, the present invention provides a plurality of air compressors integrated controller to turn on / off the air compressor by grasping the data on the driving standby time, pressure, temperature, current in real time and comparing it with a predetermined reference value when driving the plurality of air compressors In order to enable integrated control of a plurality of air compressors in accordance with reference data on driving standby time, pressure, temperature, and current of the air compressor in which the air compressor can be normally operated, and preset control values for driving the air compressor. do.

The present invention for solving the above problems,

According to the invention described in claim 1, Configuring a plurality of air compressors comprising at least one variable speed drive (VSD) air compressor and a general air compressor; Connecting the integrated controllers comprising the plurality of air compressors and an air compressor control program to communicate with each other through an RS-485 communication port; Setting, using, and storing a reference value of the used air pressure of the customer at the integrated controller; When the used air pressure of the customer goes above the reference value, stopping the air compressor sequentially in order of priority, and then reducing the pressure to restore the reference value; And recovering to a reference value by sequentially starting the stopped air compressor according to the water level when the used air pressure of the customer falls below the reference value.

According to the invention described in claim 2, Configuring a plurality of air compressors comprising at least one variable speed drive (VSD) air compressor and a general air compressor; Connecting the integrated controllers comprising the plurality of air compressors and an air compressor control program to communicate with each other through an RS-485 communication port; Setting, using, and storing a reference value of the used air pressure of the customer at the integrated controller; Starting the first VSD air compressor and supplementing the excess of the VSD air compressor by starting another general air compressor, and starting the VSD air compressor to a minimum (20%) level when the amount of demand is satisfied; When the pressure rises above the reference value due to the decrease in the demand of the customer, gradually reducing the start-up rate of the VSD air compressor to reduce the pressure while maintaining the reference value; If the pressure falls below the reference value due to an increase in the amount of demand from the customer, increasing the production capacity of the VSD air compressor to maintain the reference value by increasing the pressure while meeting the usage amount; In the above step, if the VSD air compressor is insufficient only, by starting the stationary general air compressor in order according to the priority to maintain the pressure while meeting the usage; characterized in that consisting of.

According to the invention described in claim 3, The method of claim 1 or 2, wherein the priority is characterized in that the stop / start in order of the air compressor having the largest capacity.

According to the invention described in claim 4, According to claim 1 or 2, wherein the VSD air compressor and the general air compressor is characterized in that after the conversion comprises a plurality of air compressors.

The present invention can integrate and individually control and operate a plurality of air compressors used in various industrial sites to operate a plurality of air compressors efficiently and stably, thereby increasing energy efficiency by reducing energy required for air compressor operation. It provides the benefits and effects such as stable and efficient control of the air compressor and the expected productivity improvement.

In addition, the present invention consists of a combination of the VSD air compressor and the general air compressor to configure a plurality of air compressors and control them integrally to start the air compressor to the minimum number according to the increase or decrease of the amount of use and pressure to meet the amount of use and pressure of the demand destination By increasing the efficiency of air compressors, energy efficiency can be maximized.

1 is a block diagram showing an embodiment of the present invention.

The present invention connects a plurality of air compressors to the integrated controller via the RS-485 communication port for communication control, and equipped with an electronic control device in the mechanical control device of the air compressor for communication control and according to the program of the control device of the air compressor According to the driving method, the analog method such as electric parts, various pressures, temperature, etc. is converted to digital.

That is, the conversion is performed for intelligent electronic control such as mounting a plurality of sensors in the air compressor. The conversion is an operation of digitally changing analog methods such as various pressures and temperatures of the air compressor, which will be described in detail later.

RS-485 communication port for connecting the plurality of air compressors and the integrated controller, the communication connection having a plurality of RS-485 communication ports; An RS-485 communication processor including a receiver for processing RX-DATA coming from an RS-485 communication port and a transmitter for transmitting TX-DATA for sending control data to each port; Communication protocol processing unit for processing the protocol portion in the transmission and reception data; A control input unit for receiving device-specific control data; A control processor which processes the input control data; Image display unit for displaying the status for each device; A status display processor configured to process information to display an image on the image display unit; A memory unit which stores information for each device; It includes a memory unit management unit for managing the memory unit.

The RS-485 communication port can be connected to an integrated controller installed by using a device information protocol even if connected to any port without being constrained by a port configuration connected to a plurality of air compressors. Alternatively, when multiple units are connected, they can be connected to the integrated controller and integratedly controlled.

The integrated controller automatically loads or unloads the air compressor so that the net pressure (set pressure) is maintained within the programmed range, and various loads such as no load and load pressure, minimum stop time, maximum number of motor start, etc. Branch program settings are entered.

If necessary, stop the air compressor as often as possible to save power and restart the air compressor when the actual pressure drops. If no-load operation time is expected to be too short, continue to start the air compressor to avoid too short a standstill.

In the above, the compressor is stopped if one of these measured values exceeds the start stop set point, and returned when reset.

The start stop warning setpoint is a programmable value below the start stop setpoint (pressure, temperature, overcurrent) .If one of the measured values exceeds the programmed start stop setpoint, a message is displayed to inform the driver that the warning setpoint has been exceeded. Appears on the main screen, and the general alarm (LED) is turned on, and when the warning condition is removed, the message disappears and returns.

In addition, several service tasks (exchange items by operating time) are classified into groups (levels A, B and C, each level has a programmed time interval and when the time is exceeded, a message appears on the main screen to inform the operator of the level. Alerts you to perform service operations)

In addition, the integrated controller has a function to automatically restart the compressor when the power is restored after the power cut, and when the power is restored, it must be turned on manually to start it.

As already mentioned, the plurality of air compressors convert for integrated control.

The pressure sensor is installed to detect the differential pressure on the screw suction side of the air compressor, the pressure in the separator, the compressed air pressure discharged, and the differential pressure of the oil filter so that the detected pressure value can be transmitted to the integrated controller. It is installed to detect the screw suction temperature, screw outlet temperature, separator temperature, and outlet (outlet) temperature and convert the detected temperature value to the integrated controller. This configuration of conversion is common.

The air compressor converted as described above sets the time required for Y-Δ start, feedback signal (Feed Back, a signal to check whether the actual contact is connected), etc., by taking electrical signals from the pressure sensor and the temperature sensor from the integrated controller. To judge.

The pen motor on / off for compressed air and oil cooling receives the electrical signal from the integrated controller and connects it to MC to control the pen motor power output. (Control by temperature is managed by Elektronikon)

In addition, with digital pressure sensor, screw output air pressure, pressure in separator, outgoing (outlet) pressure is inputted into bridge detection circuit by receiving voltage of 5V from integrated controller and outputted as 0 ~ 20mA current, and the current is sent to integrated controller Appears as a signal.

In addition, it is equipped with digital temperature sensor to detect screw inlet temperature, screw outlet temperature, separator temperature, and outlet (outlet) temperature, and the detected temperature signal is amplified by the micro current from the summer couple sensor and sent to the integrated controller.

In addition, the load / unload signal line is connected to receive the electrical signal from the integrated controller and to the inlet / outlet switch. {Load when open, unload when closed}

In addition, as already discussed, it connects LAN communication (RS-485 communication port) and connects communication lines to communicate with the integrated controller installed outside (control room, office, etc.).

Looking at the specific embodiments of the present invention in detail with the accompanying drawings as follows.

1 is a block diagram showing an embodiment of the present invention.

The converted air compressor is connected to the integrated controller via LAN communication (RS-485), and the start (load / no load) and stop are adjusted according to the air consumption and pressure signals, and the start time of the air compressor is checked. Sequential start-up improves the efficiency of the air compressor, adjusts the maintenance intervals, and adjusts the power consumption of the air compressor, thereby achieving the effect of energy saving.

It looks at in detail below.

The integrated controller is connected to a plurality of air compressors and RS-485 communication ports to control and operate a plurality of air compressors individually and in combination, and connects them through a connect connection port (all porters) and a CAN cable. It connects loop (serial connection) to the integrated controller by communication line and receives the signal of the pressure value from the main pressure tank where it is used and transmits it to the integrated controller.

Set and enter the reference air pressure reference value for the integrated controller.

For example, if the standard pressure is 7Bar, set the pressure to 6.8 ~ 7.2Bar, and the amount of usage decreases according to the amount of use.The pressure increases gradually.In case of 7.2Bar, the air compressor is stopped sequentially. Start the stationary air compressor to meet the usage and the pressure to return to normal.

That is, by setting the air pressure reference value used in the integrated controller, when the pressure rises above the reference value, the air compressor is stopped in sequence, and when the pressure drops below the reference value, the air compressor is started sequentially to maintain constant pressure at the set reference value. To do that.

In the above process, it is possible to judge and efficiently manage a specific exhalation (compression) first start (excellent or new) that is already programmed, or finally perform a start exhalation (low function equipment, inefficient equipment, maintenance wait, etc.) In this case, it may include a function that can be operated to operate evenly.

On the other hand, the plurality of air compressors include at least one variable speed drive (VSD) air compressor to configure a plurality of air compressors to be produced at the optimum pressure. This will be mentioned later.

The VSD air compressor may also proportionally vary the amount of compressed air (production) produced at a variable speed of 20 to 120%.

Therefore, if there is a general air compressor of the same class (non-VSD air compressor, hereinafter referred to as 'general air compressor' only when the non-VSD air compressor is distinguished from the VSD air compressor), the excess of VSD air compressor is ordinary air. The compressor is started and supplemented, and the VSD air compressor allows for a low starting capacity (20%).

On the contrary, when the general air compressor is stopped due to low usage, the VSD air compressor starts at 100 ~ 120% and then gradually starts down.

Therefore, the most efficient operation of the air compressor is possible, and the energy saving effect can be maximized.

On the other hand, the integrated controller can be configured to be remotely controlled by a personal notebook or a mobile phone by connecting to the Internet network (by Combax, etc.), and if an abnormal phenomenon such as an abnormal operation or a stop occurs during operation of the equipment, the mobile device such as a mobile phone immediately Can be configured to inform.

In addition, it saves and displays all information between the operation of the equipment and external transmission function, and saves the operation status of the integrated system and past operation activities, and the information of all the air compressors connected by LAN communication (operation time, warning, stop, Maintenance cycle, operation status, etc.) can be stored, displayed if necessary, and configured to be downloaded.

In addition, the integrated controller can control the sequential starting of multiple air compressors, and it distributes the starting load by activating another one after a certain time without starting several units simultaneously. This can be done by maintaining the transformer capacity optimally.

In addition, according to the characteristics of the place of use, an air compressor suitable for the characteristics can be determined and can be started individually.

In addition, it is possible to set and store a use time, a use cycle, and the like so that the air compressor can be stopped / started at a specific time or a specific date.

Hereinafter, an integrated controller will be described.

The integrated controller is a module program necessary for the integrated control of the air compressor, such as input, storage, and comparison of reference values such as pressure, temperature, and current required for the operation of the air compressor, and command of the optimal operation value. Algorithm, Sequential Control Algorithm, etc. hereinafter referred to as Air Compressor Control Program.) It is connected to LAN communication through RS-485 communication port with multiple air compressors.

The integrated controller consists of an air compressor control program, and sets and inputs reference values such as air pressure and demand for use according to the conditions of the production site, and is detected from pressure sensors and temperature sensors of multiple air compressors connected by LAN communication. By receiving the signal and comparing it with the stored reference value, the multiple air compressors are optimally integrated and individually controlled.

According to the present invention, a plurality of air compressors are composed of a mixed configuration of a VSD air compressor and a general air compressor, and integrated control is performed to start the air compressor with the minimum number according to the increase and decrease of the demand of the customer and meet the demand and the pressure of the customer. In order to enable the integrated control of a plurality of air compressors to be described, it will be described in detail through the following embodiments.

[Example]

-Connect at least one variable speed drive (VSD) air compressor and a plurality of air compressors including the general air compressor and the integrated controller to each other by RS-485 communication port.

The plurality of air compressors including the VSD air compressor and the general air compressor are converted for integrated control as mentioned above.

In the above integrated controller is to connect a plurality of air compressors consisting of at least one VSD air compressor and a plurality of general air compressor through a communication port to control the plurality of air compressors with an integrated controller,

The control and operation method of a plurality of air compressors integrated and controlled by the integrated controller will be described.

The integrated controller sets and inputs a reference air pressure value.

For example, if the reference pressure is 7Bar, set the range as 6.8 ~ 7.2Bar with + .- deviation.

The air compressor is started / stopped sequentially when the used air pressure is changed according to the usage amount of the customer based on the reference value.

Hereinafter, the above description will be described in more detail.

If the standard pressure is 7Bar, set it as 6.8 ~ 7.2Bar, and as the usage of the demand destination decreases, the pressure increases and reaches the 7.2Bar. Then, the air compressor is stopped in order to meet the reduced usage and drop the pressure. ~ 7.2Bar).

On the contrary, if the pressure drops to 6.8Bar due to the large amount of demand from the customer, increase the starting capacity of the VSD air compressor or start the stopped air compressor to meet the increased usage and restore the pressure to normal (6.8 ~ 7.2Bar).

That is, when the pressure rises above the reference value compared to the used air pressure reference value input to the integrated controller, the air compressor is stopped in order to drop the pressure of the air compressor, and when the pressure falls below the reference value, the stopped air compressor is started sequentially. Maintain constant pressure at the set reference value at all times.

The following describes the sequential start (start / stop) of the air compressor.

Among multiple air compressors, the variable speed drive (VSD) air compressor is started first, and if the VSD air compressor does not produce enough air, the general air compressor is started in priority order.

At this time, the starting priority of the general air compressor is decided according to the amount of use required by the customer. The priority is not particularly important when the capacity of all air compressors is the same. Prioritize the air compressors in order of priority.

Therefore, if the initial VSD air compressor is started and the excess of VSD air compressor is supplemented by other load / no-load general air compressor, and the usage of the customer is satisfied by starting the general air compressor, the VSD air compressor minimizes the starting rate (20%). Maneuver to level.

This is to start the VSD air compressor at a minimum (20%) level and start the air compressor to the minimum number by using the rest of the general air compressor to meet the demand of the customer.

As mentioned above, if the pressure of the VSD air compressor is lowered to 6.8Bar due to the increase in the amount of usage, while the start rate of the VSD air compressor is started at 20%, the production capacity of the VSD air compressor is increased to meet the usage amount. Is restored to normal (6.8 ~ 7.2Bar) and if the VSD air compressor is not enough, start the stopped general air compressor to meet the requirements of the usage and pressure.

On the other hand, if the usage of the VSD air compressor is lowered to 20% level and the demand of the customer is satisfied, the usage of the VSD air compressor is increased to 100-120% and the general air compressor is started. To meet the demand of the customer by stopping the capacity in the order of higher capacity, and then the VSD air compressor gradually decreases the speed to meet the lower usage, while dropping the pressure increased due to the decrease of the usage below 7.2Bar. Bar).

This is also to start the operation rate of the VSD air compressor to an appropriate level (100-120%) according to the increase in usage, while the remaining general air compressor is started to the minimum number so that it can be produced in accordance with the demand of the customer.

As such, the present invention is a mixed configuration of a VSD air compressor and a general air compressor to configure a plurality of air compressors and integrated control them to start the air compressor to the minimum number in accordance with the increase and decrease of the amount of use and pressure to meet the amount of use and pressure of the customer It can be produced to, so that the operation efficiency of the air compressor according to the start of the optimum plurality of air compressors can be greatly increased and the energy savings can be maximized by starting the minimum number of air compressors.

Claims (4)

Configuring a plurality of air compressors comprising at least one variable speed drive (VSD) air compressor and a general air compressor;
Connecting the integrated controllers comprising the plurality of air compressors and an air compressor control program to communicate with each other through an RS-485 communication port;
Setting, using, and storing a reference value of the used air pressure of the customer at the integrated controller;
When the used air pressure of the customer goes above the reference value, stopping the air compressor sequentially in order of priority, and then reducing the pressure to restore the reference value;
And recovering to a reference value by sequentially starting the stopped air compressor in accordance with the water level when the used air pressure of the demand destination falls below the reference value. Configuring a plurality of air compressors comprising at least one variable speed drive (VSD) air compressor and a general air compressor;
Connecting the integrated controllers comprising the plurality of air compressors and an air compressor control program to communicate with each other through an RS-485 communication port;
Setting, using, and storing a reference value of the used air pressure of the customer at the integrated controller;
Starting the first VSD air compressor and supplementing the excess of the VSD air compressor by starting another general air compressor, and starting the VSD air compressor to a minimum (20%) level when the amount of demand is satisfied;
When the pressure rises above the reference value due to the decrease in the demand of the customer, gradually reducing the start-up rate of the VSD air compressor to reduce the pressure while maintaining the reference value;
If the pressure falls below the reference value due to an increase in the amount of demand from the customer, increasing the production capacity of the VSD air compressor to maintain the reference value by increasing the pressure while meeting the usage amount;
If the VSD air compressor is insufficient in the above step, starting the stopped general air compressor sequentially according to the priority to maintain the pressure while meeting the usage; Integrated control operation method of a plurality of air compressors, characterized in that consisting of . 3. The method according to claim 1 or 2,
The priority is the integrated control operation method of a plurality of air compressors, characterized in that for stopping / starting the air compressors with the largest capacity. 3. The method according to claim 1 or 2,
The VSD air compressor and the general air compressor is integrated control operation method of a plurality of air compressors, characterized in that for configuring a plurality of air compressors after conversion.

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